Help for cache dependencies on a collection of pages

We have trouble with the caching of our contacts when we query a list of items. Once we update one of the page type items the cache doesn't invalidate. As far as I understand it, I need a special dependency for the items in that path, but I didn't had success in building that dependency. I hope some one is able to help. Big thanks in advance

public async Task<IEnumerable<ContactModel>> GetContactsAsync(string path, IEnumerable<string> authors)
    {
        var builder = new CacheDependencyKeysBuilder(_siteRepository, _cacheDependenciesStore);
        path = path.TrimEndForPath();
        builder.PagePath(path, PathTypeEnum.Children);

        var retriever = await _pageRetriever.RetrieveAsync<Contact>(
            query =>
            {
                query
                .TopN(10)
                    .PathForChildren(path)
                    .Columns(new string[] { 
                    nameof(Contact.Image),
                    nameof(Contact.Text),
                    nameof(Contact.Email),
                    nameof(Contact.Phone),
                    nameof(Contact.Gender),
                    })
                    .OrderBy(nameof(Contact.NodeLevel), nameof(Contact.NodeOrder));
                if (authors.Any())
                    query.WhereIn(nameof(Contact.DocumentName), authors.ToList());
            }, cacheSettings => cacheSettings
         .Dependencies((items, csbuilder) => builder.ApplyDependenciesTo(key => csbuilder.Custom(key)))
         .Key($"GetContactsAsync|{path}|{string.Join(",", authors ?? Array.Empty<string>())}")
         .Expiration(TimeSpan.FromMinutes(60))
       ); 

        return retriever.Select(x => _mapper.Map<ContactModel>(x));
    }